## Algebra: A Combined Approach (4th Edition)

x + y = 3 x = 2y substitude x = 2y to the first equation 2y + y = 3 simplify 3y = 3 $\frac{3y}{3}$ = $\frac{3}{3}$ divide both sides by 3 y = 1 substitude y = 1 to the x = 2y x = $2\times1$ x = 2